Prosecutors said Mr. Perez continued speeding on Montauk Highway into Hampton Bays, where he ultimately drove onto the shoulder of the road and hit another parked car which crashed into a third vehicle and its driver, 56-year-old Donna Sartori of Middle Island.

Ms. Sartori was pronounced dead at the scene.

Her husband reportedly shouted, “Yes! Yes!” in the courtroom as the verdict was read, according to a Newsday report.

District Attorney Thomas Spota said Mr. Perez’s blood alcohol level was double the legal limit at the time of the crash.

Both Mr. Perez’s court appointed attorney — George Duncan of Central Islip — and Suffolk County prosecutors couldn’t be reached for comment Wednesday morning.